Polymer mixture comprising a polyphenylene ether and optionally a polystyrene and/or a rubber-modified polystyrene, and articles formed therefrom

ABSTRACT

Polyphenylene ethers may show the property that their molecular weight increases considerably upon extrusion. This increase of the molecular weight leads to less good flow properties. It has been found that the addition of a conjugated, non-aromatic diene compound or of a dienophilic compound suppresses the increase of the molecular weight under extrusion.

The invention relates to a polymer mixture comprising a polyphenylene ether and optionally a polystyrene and/or a rubber-modified polystyrene.

Polyphenylene ether and mixtures of polyphenylene ethers with polystyrene and/or with a rubber-modified polystyrene are known per se. For this purpose reference may be made to the U.S. Pat. No. 3,306,874 and 3,383,435.

The thermoplastic polyphenylene ethers are usually prepared by oxidative coupling, in the presence of a copper-amine complex, of a substituted phenol compound. Copper-amine complexes derived from primary, secondary and/or tertiary amines may be used.

Polyphenylene ethers prepared while using copper-amine complexes are usually mixed with polystyrene or with rubber-modified polystyrene to polymer mixtures which can be extruded. Some polymer mixtures comprising polyphenylene ethers, upon extrusion from the melt, show the property that the molecular weight becomes much larger. This has for its effect that the flow properties of the polymer mixture are adversely influenced so that shaping by means of injection moulding becomes more difficult, and, for example, has to be carried out at higher temperatures.

It has quite unexpectedly been found that this increase of the molecular weight under extrusion conditions can be suppressed by incorporating certain compounds in the polymer mixture.

A polymer mixture which comprises a polyphenylene ether and optionally a polystyrene and/or a rubber-modified polystyrene, characterized in that, calculated with respect to the quantity of the polyphenylene ether present in the polymer mixture, the polymer mixture comprises 0.1-5% by weight of one or more of the following components: a conjugated, non-aromatic diene compound, a dienophilic compound or a precursor of a diene or dienophilic compound or the reaction product of one or more of the constituents of the polymer mixture.

Diene compounds and dienophilic compounds are to be understood to mean the compounds known as such for Diels-Alder reactions (see, for example, Fieser and Fieser, Advanced Organic Chemistry, New York, 1963, pp. 206-211).

Examples of suitable conjugated, non-aromatic diene compounds are cyclopentadiene and 1,3-cyclohexadiene; suitable monofunctional dienophilic compounds are, for example, maleimide, N-alkyl- or N-arylmaleimides, acenaphthylene, indene, cinnamaldehyde, N-alkyl- or N-arylmaleic acid amides, maleic acid anhydride, naphthoquinone and 2-methyl-1,4-naphthoquinone. Suitable precursors of diene compounds and/or dienophilic compounds are acenaphthenol, methendic anhydride, i.e. 5-norbornene-1,2-dicarboxylic acid anhydride with a methyl substituent, dicyclopentadiene or mixtures of maleic acid anhydride and a primary alkyl- or arylamine. Maleimides, maleic acid amides or acenaphthylene are preferably used since these compounds or the products formed therefrom are also stable at temperatures above 300° C.

The addition of bismaleimides to polyphenylene ether comprising compositions is known from U.S. Pat. No. 4,389,516. The addition of bismaleimides results in cross linkable compositions i.e. compositions which show an increase of molecular weight. It has been experimentally established that such bismaleimides result in an increase of molecular weight during extrusion of the melt. Such bismaleimides are excluded from the scope of the claims.

Stabilization of polyphenylene ethers against oxidation is known per se, for example, from U.S. Pat. No. 3,375,228. According to this Patent Specification, the polyphenylene ether is first treated to obtain hydroxyl groups in the polymer, after which the formed hydroxyl groups are reacted with a material which yields substituents in the polymer which can withstand thermal oxidation. Thermal oxidation of polyphenylene ether results in the polymer becoming dark and brittle.

However, extrusion is usually carried out under substantially oxygen-free conditions. Thermal oxidation then is not to be expected.

The known method of stabilizing polyphenylene ethers against thermal oxidation is usually carried out by treating the polyphenylene ether in solution with a reagent (see the examples of U.S. Pat. No. 3,375,228).

The polymer mixtures according to the invention on the contrary are prepared by melt-mixing, in which a reaction occurs between the diene or the dienophilic compound and the polyphenylene ether. Such a method may be carried out as follows: first the polyphenylene ether and the diene or the dienophilic compound (or a precursor of one of them) are mixed with each other in the dry state. The dry mixture is further mixed in the melted state in an extruder in which the actual stabilization of the polyphenylene ether occurs.

The polymer mixtures according to the invention comprise a polyphenylene ether. Polyphenylene ethers are known compounds. They are described, for example, in U.S. Pat. Nos. 3,306,874, 3,306,875, 3,257,357 and 3,257,358. Polyphenylene ethers are to be understood to mean homopolymers and/or copolymers. Homopolymeric or copolymeric polyphenylene ethers are preferably used which comprise units derived from 2,6-dimethyl phenol.

The polymer mixtures according to the invention may comprise polystyrene or rubber-modified polystyrene. Suitable are also polymers derived from substituted styrene compounds and copolymers, for example, styrene-acrylonitrile copolymers, styrene-butadiene copolymers, styrene-acrylonitrile-butadiene copolymers.

The polymer mixtures according to the invention may comprise the polyphenylene ether and the polystyrene in any relative quantity: the ratio of polyphenylene ether to polystyrene preferably is between 1:20 and 20:1, more in particular between 1:5 and 10:1.

In addition to the constituents mentioned hereinbefore, the polymer mixture according to the invention may comprise all auxiliary substances known in combination with polyphenylene ethers, for example, means to improve the impact strength, for example, block copolymers, means to give the polymer mixture flame-retarding properties, fillers, including glass fibers, antistatics, pigments etc.

The invention will be described with reference to the ensuing specific examples:

EXAMPLE I

In this example, samples were prepared from poly(2,6-dimethylphenylene) ether (PPE) and from the same polymer mixed with a diene or dienophilic compound as indicated in the table hereinafter. These (powdered) samples were treated thermally while excluding oxygen: they were pressed between two Teflon®-coated aluminium foils, namely 1 minute at a pressure of 20 tons, 1 minute at a pressure of 4 tons and 1 minute at a pressure of 8 tons, always at a temperature of 285° C. The resulting foil was quenched in water. The intrinsic viscosity of the resulting PPE-foils was determined by means of a Ubelohde viscosimeter (T=25° C.; CHCL₃ as a solvent).

The melt viscosity of the samples was also determined. The results obtained are recorded in Table A hereinafter. In this Table, the properties of non-compressed PPE are recorded sub A¹ and those of PPE compressed to a foil are recorded sub A².

Non-compressed PPE (A¹) has a lower intrinsic viscosity than the PPE compressed to foil at elevated temperature (A²). By adding a compound according to the invention, as indicated in Table A, said increase of the intrinsic viscosity can be avoided (Samples B to I).

                                      TABLE A                                      __________________________________________________________________________     Composition                                                                               Sample                                                              (parts by weight)                                                                         A.sup.1                                                                           A.sup.2                                                                           B  C  D  E  F G H    I                                        __________________________________________________________________________     PPE        100                                                                               100                                                                               99.5                                                                              99 98 96 98                                                                               98                                                                               98   98                                       N--methylmaleimide                                                                         0  0  0.5                                                                              1.0                                                                               2.0                                                                                4 --                                                                               --                                                                               --   --                                       Methendic anhydride                                                                       -- -- -- -- -- -- 2.0                                                                              --                                                                               --   --                                       Cyclo pentadiene                                                                          -- -- -- -- -- -- --                                                                               2.0                                                                              --   --                                       Maleic acid anh. +                                                                        -- -- -- -- -- -- --                                                                               --                                                                               1.0 + 1.0                                                                           --                                       propylamine                                                                    Dicyclopentadiene                                                                         -- -- -- -- -- -- --                                                                               --                                                                               --   2.0                                      Properties                                                                     Intrinsic viscosity                                                                       57 65  58                                                                               53 51 50 58                                                                               57                                                                               58   59                                       (ml/g)                                                                         Melt viscosity                                                                            -- 575                                                                               450                                                                               350                                                                               245                                                                               145                                                                               --                                                                               --                                                                               --   --                                       325° C., 1000 s.sup.-1                                                  (Pa · s)                                                              __________________________________________________________________________

EXAMPLE II

The samples A to G recorded in Table B hereinafter were prepared by mixing the recorded constituents in the recorded quantities with each other. The resulting mixtures were extruded: the samples A to D in a double-blade extruder the various heating zones of which were adjusted at 175°, 255°, 290°, 290°, 280° and 270° C., while the blade was rotated at a speed of 300 rpm; the samples E, F and G were extruded at an adjusted temperature of 250° C., speed 300 rpm. The melt viscosity, the melt flow index and the spiral flow length of the resulting extrudates were determined. The values found are recorded in Table B.

                  TABLE B                                                          ______________________________________                                                   Sample                                                                         A*   B      C*     D    E*   F    G                                  ______________________________________                                         Composition                                                                    (parts by weight)                                                              Poly (2,6-dimethyl-                                                                        32     32     35   35   29   29   29                               phenylene) ether                                                               Rubber-modified                                                                            64     64     53   53   67   67   67                               polystyrene                                                                    Styrene-butadiene                                                                           5      5     --   --    5    5    5                               blockcopolymer                                                                 (unsaturated)                                                                  Styrene-butadiene                                                                          --     --     12   12   --   --   --                               blockcopolymer                                                                 (saturated)                                                                    Polyethylene                                                                               1.5    1.5    1.5  1.5   2    2    2                               Zn O        0.15   0.15   0.15 0.15 0.15 0.15 0.15                             Zn S        0.15   0.15   0.15 0.15 0.15 0.15 0.15                             Phosphite stabilizer                                                                       0.9    0.9    0.3  0.3  0.5  0.5  0.5                              Mineral oil --     --     --   --   1.5  1.5  1.5                              TiO.sub.2   --     --     --   --    1    1    1                               N--methylmaleic                                                                            --      1     --    1   --   --   --                               acid amide                                                                     N--phenyl maleic                                                                           --     --     --   --   --    1   --                               acid amide                                                                     Acenaphtylene                                                                              --     --     --   --   --   --    1                               Properties                                                                     Thermal defor-                                                                             114    113    120  118.5                                                                               112  113  110.5                            mation temperature                                                             1.82 MPa; 3.22                                                                 mm bar (°C.)                                                            Melt viscosity                                                                             175    165    195  180  165  160  155                              282° C., 1500 s.sup.-1                                                  (Pa · s)                                                              Melt flow-index                                                                            6.2    6.7    7.0  11.6 5.3  8.1  5.6                              280° C.,                                                                50N (g/min)                                                                    Spiral flow length                                                             265° C. (cm)                                                                        29.5   32.5   20.5 27.5                                            280° C. (cm)                 57   61.5 64.5                             ______________________________________                                          *remark:                                                                       the examples A, C and E comprise no diene compound or dienophilic              compound.                                                                

It may be seen from the results of Table B that the addition of N-methylmaleic acid amide, N-phenylmaleic acid amide or of acenaphthylene leads to better flow properties. This is expressed in a lower value for the melt viscosity and a higher value for the melt flow index and the spiral flow length. The thermal deformation temperature of the various samples is substantially equal.

EXAMPLE III

Two samples were prepared having a composition as indicated in Table C; sample A according to the invention with methendic anhydride as a precursor of a diene/dienophilic compound and sample B without such a compound. The samples were prepared by mixing the individual constituents. Extrusion was then carried out in a double-blade extruder with the following temperature adjustments in the various zones: 280° C., 280° C., 280° C., 290° C., 295° C. (300 rpm). Test pieces were manufactured from the resulting extrusion samples by injection moulding. The thermal deformation temperature, the melt viscosity and the length of the flow spiral of the test pieces were determined. Moreover a few mechanical properties were measured. The results obtained are recorded in Table C.

                  TABLE C                                                          ______________________________________                                         Sample                 A       B*                                              ______________________________________                                         Composition (parts by weight)                                                  poly(2,6-dimethylphenylene) ether                                                                     32      32                                              rubber-modified polystyrene                                                                           64      64                                              (10% rubber)                                                                   Unsaturated styrene-butadiene-                                                                        5       5                                               styrene blockcopolymer                                                         Polyethylene           1.5     1.5                                             ZnO + Zn S             0.3     0.3                                             Fosphite stabilizer    0.9     0.9                                             Methendic anhydride    1       --                                              Properties                                                                     Thermal deformation temperature                                                                       116     116.5                                           1,82 N/mm.sup.2 ASTM D 648° C.                                          Melt viscosity, 282° C.,                                                                       187     205                                             1500 s.sup.-1 Pa · s                                                  Spiral flow length     474     423                                             295° C. mm                                                              Notch impact value accord-                                                                            280     275                                             ing to Izod with notch                                                         ASTM D256 J/m                                                                  Tensile strength       55.2    54.3                                            DIN 53455 N/mm.sup.2                                                           Elongation upon fracture                                                                              22      26                                              DIN 53455 %                                                                    ______________________________________                                          *For comparison                                                          

It may be seen from the Table that the addition of methendic anhydride improves the flow properties without any noteworthy change of mechanical properties occurring.

EXAMPLE IV

Two samples of glass fibre-filled polymer mixtures were prepared: sample A with a dienophilic compound according to the invention and for comparison sample B without a dienophilic compound. The resulting samples were extruded and injection moulded. The mechanical properties and the flow properties of the samples were determined. The samples according to the invention showed a considerable improvement of the flow properties at a slightly lower value for the mechanical properties. The composition of the samples and the flow properties found are recorded in Table D below.

                  TABLE D                                                          ______________________________________                                         Sample                 A       B*                                              ______________________________________                                         Composition (parts by weight)                                                  Poly(2,6-dimethylphenylene) ether                                                                     35      35                                              Rubber-modified polystyrene                                                                           36      36                                              Glass fibres           30      30                                              Polyethylene           1.5     1.5                                             ZnO + ZnS              0.2     0.2                                             Phosphite stabilizer   0.3     0.3                                             N--phenylmaleic acid amide                                                                            2.0     --                                              Properties                                                                     Thermal deformation temperature                                                                       140.5   142.5                                           1.82 MPa °C.                                                            Melt viscosity         253     295                                             282° C.; 1500 s.sup.-1 Pa · s                                  Flow spiral length     52      42                                              300° C. cm                                                              Impact strength according                                                                             87 ± 3                                                                              96 ± 2                                       to Izod without a notch J/m                                                    Tensile strength upon  87      96                                              fracture MPa                                                                   ______________________________________                                    

EXAMPLE V

Four samples were prepared: A* without N-phenylmaleamic acid, B, C and D with this compound. All four samples comprised an agent for providing flame-retarding properties (an organic phosphate compound). The composition of the matrix was as follows: 55 parts by weight of PPE, 45 parts by weight of rubber-modified polystyrene, 1.5 parts by weight of polyethylene, 0.15 parts by weight of ZnO, 0.15 parts by weight of ZnS, 0.15 parts by weight of ZnS, 4.5 parts by weight of diphenylcresylphosphate, 0.5 parts by weight of organic phosphite stabilizer. The quantity of N-phenylmaleamic acid is indicated in Table E. The various constituents were mixed and the resulting mixture was extruded in a double-blade extruder at 285° C. and 300 rpm. The properties of the extrudate are recorded in Table E. From this it may be seen that the addition of N-phenylmaleamic acid to PPE mixtures with flame-retarding additives results in better flow properties.

                  TABLE E                                                          ______________________________________                                         Sample         A*      B       C      D                                        ______________________________________                                         N--phenylmaleic acid                                                                          --      1.5     2      3                                        (parts by weight)                                                              Properties                                                                     Thermal deformation                                                                           123     120.5   120.5  120.0                                    temperature °C.                                                         Melt viscosity 210     180     175    165                                      282° C.; 1500 s.sup.-1 Pa · s                                  Flow spiral length                                                                             49     57      57,5   61                                       T = 290° C. cm                                                          Flame extinction accord-                                                                       81     68      103    92                                       ing to UL 94 total                                                             time 5 rods of 1/16                                                            inch, approx. 1.5 mm.                                                          10 × ingnited s                                                          UL 94:         V1      V1      V1     V1                                       ______________________________________                                          *for comparison                                                          

EXAMPLE VI

A mixture was prepared consisting of 70 parts by weight of PPE and 30 parts by weight of rubber-modified polystyrene. The resulting mixture was divided into four equal parts. To each part a different quantity of N-methyl maleamic acid was added (as recorded in Table F). The mixtures were extruded (310° C.). The flow properties of the resulting extrusion products were determined (see Table F). It may be seen from Table F that an increasing content of N-methylmaleamic acid leads to a further improvement of the flow properties.

                  TABLE F                                                          ______________________________________                                         Sample           A*      B       C     D                                       ______________________________________                                         N--methylmaleamic acid                                                                          0       0.625   1.25  2.5                                     (parts by weight)                                                              Properties                                                                     Melt viscosity   465     360     350   295                                     T = 300° C., 1500 s.sup.-1 Pa · s                              Flow spiral length                                                                              27.5    38.5    39.5  46.5                                    T = 295° C. cm                                                          Increase flow spiral                                                                            --      40      43.5  69.1                                    length with regard to                                                          reference A* %                                                                 ______________________________________                                          *for comparison                                                           

We claim:
 1. A polymer mixture comprising:(a) a polyphenylene ether resin or a mixture of polyphenylene ether resin and polystyrene resin; and (b) 0.1 to 5.0% by weight based upon the weight of said polyphenylene ether resin of a monofunctional dienophilic compound.
 2. A polymer mixture as claimed in claim 1, characterized in that the mixture further comprises 5-40% by weight of glass fibres.
 3. A polymer mixture as claimed in claim 1, characterized in that the mixture also comprises an agent to give the mixture flame-retarding properties.
 4. A polymer mixture as claimed in claim 1, characterized in that the mixture also comprises a block copolymer having styrene blocks and butadiene blocks.
 5. Articles formed from the polymer mixture as claimed in claim
 1. 6. A polymer mixture as in claim 1 wherein said dienophilic compound is selected from the group consisting of maleimide, N-alkylmaleimide, N-arylmaleimide, acenaphthylene, indene, cinnamaldehyde, maleic acid anhydride, N-alkylmaleic acid anhydride, N-arylmaleic acid anhydride, N-arylmaleic acid amide, naphthoquinone, and 2-methyl-1,4-naphthoquinone.
 7. A polymer mixture as in claim 1 wherein said polystyrene resin is rubber-modified polystyrene. 